Dragging a phase card between stages while one of its members has an
agent in it is a move nobody can mean: the card lands somewhere its
branch, its worktree and its live agent are not. The board refuses it,
and names the way through rather than the wall — which member is
working, and that ‖ hold stops the phase and the agent it has in flight
while leaving the branch, the merges and every worktree as they were.
- phases.assert_not_working() is the refusal: it reads the one file
first, so an ordinary card never reaches the question, then resolves
the phase's list and asks what is actually running.
- agents.working_on() answers that from the processes themselves, not
from the registry's status alone — the reaper flips that a moment
after a run ends, and a rule that only refuses must not hold a card
hostage to a run that has already died. stop_phase() now reads the
same helper.
- httpd asks it on /api/move, /api/archive (archiving is a move) and
/api/task/complete, so a stale page cannot get past it.
- The toast wraps, is bounded to the viewport and stays up for as long
as its text takes to read: a refusal you cannot finish reading is the
wall this was written against.
What still moves: a phase between members, a halted phase, a held one,
a member card, and every ordinary card.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
